BOARD01485

• Board Meeting Date: 11/19/2001
• Description: Flood Section - Floodplain Designations and Approvals
• Board Meetings - Doc Type: Memo

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STATE OF COLORADO

Colorado Water Conservation Board
Department of N amral Resources
1313 Sherman Street, Room 721
Denver, Colorado 80203
Phone: [phone]
FAX: [phone]
www.cwcb.state.co.us

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Bill Owens
Governor

MEMORANDUM

Greg E. Walcher
Executive
Director

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Colorado Water Conservation Board Members, /
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Larry Lang, Chief, Flood Protection Section LA
Tom Browning, P.E., Flood Protection Section:;:::f!j

November 6, 2001

Dan McAuliffe
Deputy Director

Rod Kuharich
Director

FROM:

DATE:

SUBJECT: Consent Agenda Items 2.a and 2.b
November 19-20, 2001 Board Meeting
Floodplain Designations and Approvals

SUMMARY

Consent Agenda Items 2.a and 2.b include two floodplain studies/maps proposed for CWCB
action, Staff is requesting Board designation and approval for both items. A brief summary of
the studies is presented below.

CWCB staff performs technical reviews of floodplain information to assure the Board that the
information is in compliance with the requirements of the CWCB's "Rules and regulations for
the designation and approval of floodplains and of storm or floodwater runoff channels in
Colorado," 2 CCR 408-1. Furthermore, Sections 31-23-301 and 30-28-111, Colorado Revised
. Statutes, state that legislative bodies of local jurisdictions may provide zoning regulations for
land uses on or along any storm or floodwater runoff channel or basin only after designation and
approval by the CWCB. In addition, Section 37-60-106(1)(c), Colorado Revised Statutes, directs
the CWCB to designate and approve storm or floodwater runoff channels or basins and to make
such designations available to legislative bodies of local jurisdictions.

The. CWCB's designation. and 'approvaIs gieatly assist local communities ill meeting the statutory
requirements of the State and the regulatory requirements of the National Flood Insurance
Program, Floodplain information is broadly categorized as detailed or approximate using the
following defInitions. Detailed floodplain information means floodplain information prepared
using topographic base maps, hydrologic analyses, and hydraulic calculations to arrive at precise
water surface profIles and floodplain delineations suitable for making land use decisions under